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Патент USA US2127614

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Aug. 23, .1938.
‘
'
-
J. w. PARKER
GRINDIING WHEEL DRESSING‘UNIT
2,127,614
'
Filed Dec. 5, 1935
INVEN TOR.
ATTORNEYS. ‘
2,127,614
Patented Aug. ' 23, 1938
UNITED STATES -
PATENT OFFICE‘.
2,127,614‘
GRINDING WHEEL DRESSING UNIT
John W. Parker, Detroit, Mich.
Application December 5, v1935, Serial .No. 52,937
5 Claims. (Cl. 125-11) '
porting table 2 by means of bolts ll‘ passing.
The invention relates to a grinding wheel dress
‘through a base ?ange l2 of the bed. ~The top
of the bed is semi-circular_in form, as shown in
supporting bed of a grinding machine. ‘
Figure 1, and is provided at its center with a
The general object of the invention is'to provide , vertical bore l3 and a concentric slot Ill. .The 5
5 a dressing unit adapted to dress a grinding wheel underside of the bed i0 is provided with an en
to provide a grinding. face of complex contour larged opening l5 coaxial with the bore l3 and
with great accuracy.
'
the shoulder between the bores I3 and I5 is
Another object of the invention is to provide provided with a conical bearing surface IS. A
ing unit adapted to_ be mounted upon the Work
a/dressing unit having sufficient ?exibility to dress
similar but oppositely disposed conical bearing 10
10 the grinding face of a wheel on any desired radius
or on straight line at any angle to the wheel
axis, or any desired combination of arcs and
straight lines.
surface I‘! is provided at the upper end of bore
l3.
Another object of the invention is to provide
15 a dressing unit of the type mentioned having in
herent therein means to locate the diamond
dressing tool‘ accurately inpany desired plane of
reference, in combination with means for estab
lishing the path of the tool from such plane of
reference in any direction in order to .positively
?x the contour of the wheel face independently
of the wheel itself.
'
Referring to the drawing in which a preferred
form of the invention is shown and wherein like
25 numerals are applied to like parts in the several
views,
Fig. 1 is a plan view of the dressing unit.
Fig. 2 is an elevation, looking from the right
of Figure 1.
30
.
A vertical trunnion l8 of a turntable I9 is
.
-
Fig. 3 is a vertical section, taken on the line
3-3 of Figure 1.
Referring to the drawing, there is shown a
portion‘ of a grinding wheel I and a work sup
porting table 2 mounted on the bed 3 of the
grinding machine for relative movement in lines
parallel and perpendicular to a. vertical plane
through the wheel axis. The mounting of the
grinding wheel and work table on the bed may
iournaled within the bore l3 of bed It. The
trunnion I8 is provided with a conical bearing 16
surface at its upper end adapted to cooperate
with the conical portion ll of the upper end of
the bore, and is provided at its lower end with
an integral cylindrical extension 20 of reduced‘
diameter.
An annular bearing member 2| sur- .
rounds the reduced extension 20 andhas a snug
?t therewith, and a pair of lock nuts 22 and 23
are threaded on the end of the extension 20
for the purpose of adjustably ?xing the position
of the annular bearing member 2|. Any suitable
>means, such as the pin and slot connection 23' '
shown in Figure 3, may be utilized to prevent
relative turning movement between the annular
bearing~ member 2| and trunnion it! without
interfering with relative axial movement of these
members. A pressed metal guard 24 surrounds
the upper end of trunnion l8 and has a downward
ly extending peripheral ?ange overlying a co- '
operating boss or raised portion on the topv of
bed In to prevent the entrance of abrasives into 35
the bearing between trunnion l8 and the table.
The trunnion mounting just described may be ad
justed by nuts 22 and 23 to have a very close fit
in the opposed conical portions of bore l3 for
be effected in any conventional manner to pro
the purpose of accurately ?xing the axis of ro
4o duce the desired relative movement, but, for the tation of the turntable I9.
purpose of illustration, the worktable 2 is shown / The turntable I9 is provided with a downward-v
mounted on aslide 4 which in turn is mounted - ly extending ?nger 25_ adapted, during pivotal
upon ways 5 on the bed 3 of the machine. By movements of the turntable, to
e along the
operating a suitable control shaft 6, the table outer peripheral arc of the bed In‘; and the outer 45
45 2 may be reciprocated in a plane perpendicular edge of the bed I0 is calibrated, as shown at
to the axis of the grinding wheel. Operation of .26 in Figure 2, to indicate the angle at which
a control shaft v‘I reciprocates the slide 4 and the ‘ the turntable is positioned with respect to a line
table 2 in a plane .parallel to the axis of‘ the perpendicular to the axis of the grinding wheel.
grinding wheel. ‘,In addition to the above, the A stud bolt 21‘ is threaded into the underside of 50
50 grinding wheel shaft is adjustable vertically with
respect to the d 3 in any conventional manner.
not shown, in order to position the axis of the
wheel‘ in the same horizontal plane as the work.
The dressing unit shown in the drawing com
"55 vprises a bed In ?xedly secured to the work-sup-_
the turntable l9, passes through the arcuate slot
‘l4 and is provided with a thumb nut 28 by means
of which the turntable may be ?xed in adjusted
position.‘
,
.
>
A slide member 29 is mounted upon the turn
55
.
2, 127,6 14
table ‘8 9 and connected for sliding movement with‘
respect thereto by means of the conventional
the trunnion 55 between the bed l9 and the
dovetail slide arrangement shown at 30 in Figure
It will be apparent that if the distance between
2. A feed screw 3| rotatably carried by ‘the turn
table is threaded into a block 32 having an in
tegral projecting pin 33 journaled in a vertical
arm
55. '
i
.
the face 55 and the axis of trunnion I8 is known,
the plane of the diamond point 52 may be ac
curately positioned either in the plane of the
bore in the slide member 29. The feed screw axis of trunnion it or on either side thereof by
3| is ?xed against axial movement with respect any desired amount merely by the use of gauge
to the turntable by collars 35 and 35 positionedv blocks between the face 56 and the point 52, or by
10 on opposite sides of an upstanding ?ange 36 on
means of the micrometer adjustment on feed
the turntable with the result that'rotation of the screw 3|. Should it be desired to position the dia 10
feed screw effects longitudinal sliding movement mond point at a greater distance to the left of
of slide member 29. Collar 35 may be provided ‘the axis of trunnion l8 than the normal plane
with a micrometer scale calibrated in terms of
of surface 56, it is only necessary to withdraw
15 the distance through which member 29 slides
trunnion
55 and insert a thicker washer in place
for a given‘v rotation of the feed screw.
of washer .51, or the same thing may be accom
Slide member 2971s provided with a horizontal
bore 3'! extending parallel to and directly above plished by feeding the diamond point into contact
the feed screw 3| ‘and intersecting the axis ofv with the surface 56 when a thin washer 5] is
used, then by swinging ‘arm 54 out of the way
20 trunnion I8. The ends of bore 3? are‘ provided
further
movement“ of diamond point 52 can be 20
with oppositely directed conical bearing surfaces, eii’ected for
measureddistance by means of the
similar to those described with respect to bore micrometer ascale.
‘
| 3 in bed I0; and journaled in bore 37 is a trun
In operation, the dressing unit is extremely
nion 38 having a conical bearing enlargement 39
flexible and may be operated in any one of a
25 adapted to cooperate with the left hand conical
bearing surface in bore 31. An annular bearing large number of different methods depending 25
the nature of the grinding surface desired
member 40, having a conical surface adapted to upon
and
the
will of the operator. Ingrinding arcs,
cooperate with the other conical bearing surface
it
is
necessary
to position the axis of trun
in bore 31, is slidably mounted on trunnion 38 nion It! on the?rst
center of the are by means of
30 and is held against axial movement by a handle\\
the conventional adjustments provided for the
éil which, in turn, is ?xed on trunnion 38 by ‘grinding wheel and work table 2, thereupon 30
means of a nut 42 threaded on the reduced end
arm 5| carrying the diamond point 52 may be
of trunnion 38. The handle 4| is ?xed against ?xed in position by means of pin 44 and the
rotational movement with respect to trunnion diamond point positioned at the desired radius‘
38 by means of a pin 53 extending through the
trunnion‘ and handle members. When handle from the axis of trunnion l8 by means of the 35
reference plane 56, gauge blocks, and the microm
lil is in the vertical position shown a pin M hav
eter adjustment on feed screw 3|. If the wheel
ing a knurled end is adapted to be inserted
through aligned. openings in the handle 4| and is to be ground with a convex face it is obvious
the body" of slide member 29 to ?x trunnion 38 that the diamond point would have to be posi
against rotation. A cap screw 55 having a lock - tioned to the right of ‘axis of trunnion It, as 40
viewed in Fig. 3, by an amount equal to the
nut 155 is threaded into the slide member 29 and
radius
of curvature, while a concave grinding
may be utilized to engage and lock the trunnion face may
be provided by shifting the diamond
member 38 against rotation when’ the openings point to the
opposite or left side of the axis of
in handle 4| and slide member 29 are not aligned. trunnion I8. Once the proper setting is secured
Fixed to the left-hand end of trunnion 38, as the face is dressed by swinging turntable l9 about 45
viewed in Figures 1 and 3, is a split clamping , trunnion I8.
member 50 in which is clamped the lower end
When it is desired to dress the face on a
of an arm 5| carrying a diamond point cutting straight
line parallel to the axis of the grinding
50 element 52. A cap screw 53 passes through one
wheel, and the width of the face is to be sub
of the bifurcated ends of‘the clamping member stantial, this can be accomplished by ?xing arm 50
50 and is threaded to‘the other for tightening 5| in the position shown in the drawing and
the member about the lower end of arm 5|. > The '
feeding the work table 2 and the wheel axially
parts are so arranged that when the knurled with respect to each other by means of the con
pin
44is
passed
throughv
the
openings~in
the
55
ventional feed screws of the grinding machine.
handle 4| and- the slide member 29, the arm not shown. The unit, however, is particularly 55
5| will extend vertically with the diamond point adapted for dressing straight line faces of small
in the plane of the axes of trunnion members 1 width since these can be dressed by ?xing the 38 and I8. A raised portion 61 on member 29 >work table 2 and wheel- support and merely
60
is provided with a pointer adapted to cooperate: swinging the arm 5| by means of handle 4| .
with a micrometer scale on the lower end of
handle M to indicate the extent of movement of
the diamond point.
'
Anarm 54 having ?xed thereto a horizontally
65 extending trunnion 55 journaled in the bed III on
an axis in a plane perpendicular to the axis of
the grinding wheel is provided for establishing
a reference plane for the diamond point with
respect to the axis of trunnion member l8. For
70 this purpose the arm 54 is provided with a refer
ence surface 56 which is positioned very accu
rately ‘at a known distance from the axis of the
trunnion l8. The distance between the plane of
surface 56 and the axis of trunnion I8 is ?xed
75 by means of a collar or washer 51 positioned on
through the small are necessary to dress a
straight parallel face. The face can be dressed
'at any angle by merely rotating the turntable to
the desired angle as indicated by pointer 25 on the
scale at “the periphery of‘ the bed l0, ?xing it in
the adjusted position and then swinging arm 5|
by means of handle 4|.
I
_The device is of particular value where it is
desired to dress the face of a grinding wheel
into a pro?le composed of the combination of one
or more radii and one or more straight lines.
70
For example, when dressing a face, the pro?le of
which includes a pair of straight lines intersect
ing at an: angle, the axis of trunnion l8 can be
?xed on the point of intersection of the two
75
2,127,614
- straight lines on the grinding face. ‘From that
position, after one of the surfaces'is dressed by
swinging arm 5| back and forth, it is only neces
Cl
sary to rotate the turntable through the desired
angle to position the diamond point‘ in a ,plane
wherein it will dress the other, straight line by
‘movement of the arm 5| in the opposite direction.
3
table in a' plane "perpendicular to the turntable
axis, an arm pivoted to said slideable member on
an axis in a plane perpendicular to said turntable
axis,'a cutting element carried by said arm eccen
trically of said arm pivot, and means for estab
lishing a ?xed plane of reference for said cutting
element‘ with'respect to said work support, said
While certain of the outstanding capabilities a means including an arm pivotally mounted on an
of the unit are described above, it is believed
10 clear that the device is adapted for use in: other
ways than those outlined. Moreover, in any case
it is possible, by means of the plane of reference
established by surface 56 on arm 54, and suitable
trigonometric or other mathematical calculations,
15 to determine the settings and amount of adjust
ment required on the turntable, the micrometer
screw 3! or the swinging arm 5| for any given’
axis ?xed with respect to said work support and
swingable in a plane parallel to the axes of said 10
wheel and said turntable.
‘
3. In combination, a grinding wheel having a
bed, a grinding wheel rotatably supported on said
bed; a work support carried by said bed,'said
grinding wheel and work support being relatively 15
movable in lines parallel and perpendicular to
the plane of the wheel axis, a cutting element,
means for connecting the cutting element to the
bed including a pair of trunnions positioned at
right angles with respect to each other, said cut 20
grinding pro?le. The extent of these adjust
ments is indicated by suitable micrometer scales.
The dressing unit is of particular value in
20
dressing a very narrowface grinding wheel hav » ting element being mounted on one of said trun
‘ing a complicated grinding contour such as would nions and the other of said trunnions being
be used for grinding small complicated elements, mounted on said bed, independent means for ad
but it is obvious that it may be applied} to larger justably' ?xing said trunnions against rotation
respectively, means for adjusting one of said 25
25 grinding surfaces with advantage.
trunnions axially thereof with respect to the
_ I claim:
_
1. In combination, a grinding machine having other, and means for establishinga ?xed plane
a bed,_a grinding wheel rotatably supported on of reference for, said cutting element withre
said bed,- a work support carried by said bed,\spect to saidvwork support.
30 means for adjusting said grinding wheel and.
work support relatively'in lines parallel and per
4. In a grinding wheel dressing unit, a bed, a
trunnion rotatably carried by said bed, .an arm "
pendicular to‘ a vertical plane through the axis
pivotally connected to said trunnion onvan axis
linear movement perpendicular to theaxis of the
of said trunnion axis.
of the wheel, a wheel dressing unit mounted on perpendicular to the trunnion axis, a cutting ele
ment carried by said arm 'eccentrically of said
said work support, said unit comprising a turn
‘pivot, and_ means for adjusting said -arm with. 35
tablerotatably
carried
on
an
axis
?xed
with
35
respect to the work support and located in a plane ' respect tcysaid trunnion rectilinearly in a direc- ,
perpendicular to the wheel axis, a slide member tion parallel to said pivotal axis to selectively,
position said cutting element. on opposite sides
\ adiustably carried by said turntable’for'recti
_
v
5. In a grinding wheel dressing unit, a-bed, a 40
an arm pivoted to said slide member ,
40 turntable,
on an axis perpendicular to and intersecting the trunnion rotatably carried by said bed, an arm
axis of said turntable, and a cutting element car- - pivotally connected to said trunnion on an axis
ried by said arm eccentrically ‘of said am pivot.
2. In combination, a grinding machine having
a bed, a grinding wheel rotatably supported on
45 said bed, a work support carried by said bed, said
grinding wheel and work support being relatively
movable in lines parallel and perpendicular to
the plane of the wheel axis, a turntable pivotally
mounted on said work support, a slideable member
movable rectilinearly with respect to_ said tum-
perpendicular to the trunnion axis, a cutting- ele
ment' carried by said arm eccentrically of said
pivot, independent means for adjustably ?xing 45
said arm and trunnion against rotation respec
tively and means for adjusting said arm with
respect to said trunnion rectilinearly in adirec
tionparallel to said pivot axis.
\
JOHIl w. PARKER.
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